package com.petercat;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;

public class PeterCat {
	private int port;

	private static final String SHUTDOWN_COMMAND = "/SHUTDOWN";
	Logger logger = Logger.getLogger(PeterCat.class);

	// the shutdown command received  
	private boolean shutdown = false;

	public static void main(String[] args) {
		PeterCat server = new PeterCat();
		server.readServerConf("conf/server.xml");
		server.await();
	}

	public PeterCat() {
		PropertyConfigurator.configure("conf/log4j.properties");
		logger.info("Peter-cat start");
	}

	private void readServerConf(String confFile) {
		port = Integer.parseInt(PeterCatLib.readXML("conf/server.xml", "/Server/@port"));
		logger.info("port=" + port);
	}

	public void await() {
		ServerSocket serverSocket = null;
		try {
			serverSocket = new ServerSocket(port, 1, InetAddress.getByName("127.0.0.1"));
		} catch (IOException e) {
			e.printStackTrace();
			System.exit(1);
		}

		// Loop waiting for a request  
		while (!shutdown) {
			Socket socket = null;
			InputStream input = null;
			OutputStream output = null;
			try {
				socket = serverSocket.accept();
				input = socket.getInputStream();
				output = socket.getOutputStream();

				// create Request object and parse  
				Request request = new Request(input);
				request.parse();

				// create Response object  
				Response response = new Response(output);
				response.setRequest(request);

				//check if this is a request for a servlet or a static resource  
				//a request for a servlet begins with "/servlet/"  
				if (request.getUri().startsWith("/servlet/")) {
					ServletProcessor processor = new ServletProcessor();
					processor.process(request, response);
				} else {
					StaticResourceProcessor processor = new StaticResourceProcessor();
					processor.process(request, response);
				}

				// Close the socket  
				socket.close();
				//check if the previous URI is a shutdown command  
				shutdown = request.getUri().equals(SHUTDOWN_COMMAND);
			} catch (Exception e) {
				e.printStackTrace();
				System.exit(1);
			}
		}
	}
}
